Structure 5070004 · Bon Homme County, SD
Carries 29140 408th Avenue over Trib. To Emanuel Creek, 11.6n & 8w Of Tyndall.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 3 of 9.
How ratings work23 ft end to end, longest span 11 ft. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a slab bridge.
| State | South Dakota |
| County | Bon Homme |
| Location | 11.6n & 8w Of Tyndall |
| Carries | 29140 408th Avenue |
| Crosses | Trib. To Emanuel Creek |
| Coordinates | 43.16219, -98.03012 |
| Material | Concrete Continuous |
| Design | Slab |
| Total Length | 23.3 ft (7.1 m) |
| Max Span | 11.2 ft (3.4 m) |
| Deck Width | 19.4 ft (5.9 m) |
| Deck Area | 41.9 sq m |
| Main Spans | 2 |
| Year Built | 1930 |
| Avg Daily Traffic | 50 (2022) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
| Last Inspection | July 2024 |
| Inspection Frequency | Every 12 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | Unknown |
| Structure Number | 000000005070004 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.